Bead

Dispensing technology

Process by which compressed material is dispensed from a nozzle to form a cord.
The bead is created to guarantee a function on the parts applied.
It can be gluing between 2 parts, sealing to prevent from water or air invasion, blocking vibrations with mechanical force and added weight, object collision and damages prevention (antichip) with thick protective film, anti-corosion efect with thick film of technical material.

Basic dispensing system

Simple regulation (piloted or manualy adjusted) can make the job. Constant speed of the applicator is then required to make a constant bead: combination of the volume delivered at the nozzle and the displacement of the said nozzle.

To improve the system we can use a recirculation,, to get stable conditions of the material, especially with high viscosity and rheology (ability to change of viscosity with material shearing in the hoses).

Shotmeter: perfect volumic bead control

The best way to control precisely a bead application is to generate a volumetric movement in a chamber filled with material by a servomotor (shotmeter). However it can be an expensive system when one's need a constant bead application, needing to have a double shotmeter per application post.

REGULATION of the bead volume with a pressure control will work in the most common applications.

CLOSE LOOP REGULATION with the proper selection of the pump and the working conditions will allow optimum performances to dispense precisely a bead on parts.

SHOTMETER for a full control of the bead is the best solution but it is also complex to use and has the highest TCO.